Improvement in stove-pipe-elbow machines



Z Sheet S-heet 1.4

W. T. MMILLEN. STOVE-PIPE ELBOW MACHINE.

No.177,Z65. Patented May 9,1876.

- Fig.1.

WITNESSES I JV V'EJV' TOR fitter-new PETERS. PHOTO-LITHOGRAPNER, WASHINGTON. D C.

2Shee ts-Sheet2., W. TLMcMIL'LEN. STOVE-PIPE ELBOW MACHINE.

' No. 177,265. Patented May 9,1876.

W'ITJVESSES 1.7V V'EATOR MPETERS. PHOTO-LITHOGRAPHER WASHINGTON D C.

UNIT D STATES PATENT WILLIAM T. MCMILLEN, :OF CINCINNATI, OHIO.

IM PROVEMENT IN STOVE-PlP E-EL BOW MACHINES.

Specification forming part of Letters Patent No. 177,265, dated May 9, 1876; application filed October 4, 1875.

To all whom it may concern:

Be it known that I, WI'LLIAM T. MOMI LEN, of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Crimping and Bending Stove-Pipe Elbows; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation, showing the dies closed and die-blocks open. Fig. 2 is a similar view, showing the dies expanded and die-blocks closed. Fig. 3 is a side elevation of the machine, and Fig. at is a longitudinal central section of the same.

Similar letters of reference in the accompanying drawings denote the same parts.

This invention relates to that class of machines for crimping stove-pipe elbows in which the crimp is formed on the exterior surface of the'pipe, and has for its object to improve the construction and operation of such machines, so as to enable the crimps to be produced more rapidly and uniformly than heretofore. To these ends the invention consists, first, in the combination of internal expanding-dies with external contracting die-blocks, for form ing the crimps; secondly, in mechanism for closing and finishing the crimps after they are formed; thirdly, in mechanism for feeding the pipe through the crimping devices; and, fourthly, in certain details of construction, hereinafter more fully described.

In the accompanying drawings, A represents the frame of the machine; B, a hollow metallic cylinder, suitably mounted thereon;

: G, a shaft, passing longitudinally through the cylinder B, and having its hearings in heads I) b therein 5 C G, cams of quadrangular form, with rounded corners, rigidly secured to the shaft 0; and F, a block, mounted loosely upon the shaft between the cams C O. E E E E are dies, each of which is mounted on short rods 6 0 extending from the inner circumference of the cylinder B to the block F. The inner surfaces of said dies correspond in shape with the cams 0 0, against which they are adapted to fit in their normal position. The dies E E E are each provided with a pcripheral rib or projection, 6 of uniform thickness, and the die E has a rib, e gradually tapering fromjthe ends toward the center there of, where it vanishes.

By this construction, it will be seen that when the shaft 0 is rocked the dies E E E E are forced outward by the cams O G, be-

ing guided by the bolts 0 e, and are returned by the cams G 0, said blocks being provided with grooves or recesses jj, to receive the peripheral ribs or projections on the dies. The upper block J is operated by the treadle I, through the medium of rods j j, while the lower block J is operated by bell-crank levers L, pivoted within the hollow posts K, the inner arm of said levers projecting through the posts int-o sockets in the block J, and their outer arms connected to the treadle I by rods 3' 3". By this arrangement the jaws are caused' to approach each other when the treadle is pressed, and vice versa.

M is a plate or jaw, corresponding in shape with the lower die-block J, and mounted on rods m, passing transversely through the latter.- M M are plates, similarly formed, secured to the inner ends of the rods m, and N is an eccentric located on a cross-shaft, n, between the plates M M The eccentric N is oscillated through the medium of a crank, O, secured to the shaft n, and connected to the treadle I by a rod, 0.

By the operation of these or jaw M is made to alternately close and recede from the crimping-block J, and close and finish the crimps as they are formed by the dies. The pipe to be operated upon is placed on the cylinder B, and fed to the crimping devices by the following mechanism: P is an arm extending along the upper surface of the cylinder B, and having a longitudinal slot or groove, 1), in which slides a plate, Q. This plate is reciprocated by a bell-crank, lever, It,

devices the plate mounted on a cross=shaft, r, and connected to the upper portion of the die-block J. Small pins 8 are inserted in holes in the plate Q, near the outer end thereof, which bear down upon the pipe on the cylinder. Behind each pin 8 is a spring, 8, the tendencyof which is to press the pins outward. As theplate is reciprocated, the pins drop, one byone, behind the pipe onto the cylinder, and feed the pipe forward to the crimping devices, where itris crimped, and the crimps closed and finished, as hereinbefore stated.

It will be observed that each time the treadle Iis pressed a crimpis formed in the pipe, and. the preceding crimp closed and finished by the jaw M, while a reverse movement ofthe treadle feeds the pipe forward the distance i of one crimp. The operation of themachine is, therefore, regular, continuous, and rapid. n

One crimp can be made in a second, or sixty a minute, and as there are about twelve crimps required for each elbow five completed elbows can be produced in a minute.

It may be found necessary in practice to vary the arrangement of levers, rods, 850., but

this can be done without altering the principles of operation.

The plate Q and attachments maybe raised by any suitable means to allow the pipe to be slipped onto the cylinder.

I claim as my invention-- 1. In amachine for making stove-pipe elbows, the combination of a series of internal expanding-dies with external contracting dieblocks, for the purpose of forming external 

